CN103934307B - There is the hollow parts manufacturing process of local flaser texture - Google Patents
There is the hollow parts manufacturing process of local flaser texture Download PDFInfo
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Abstract
The invention discloses the manufacturing process of a kind of hollow parts with local flaser texture, belong to forming high pressure in pipe technical field。Differ relatively greatly for maximum cross-section girth after shaping and smallest cross-sectional girth and maximum cross-section deformation extent is more than the hollow parts of the elongation percentage of blank tube material own, select girth tubing between hollow parts maximum cross-section girth and smallest cross-sectional girth as hollow bloom。By pipe mid portion reducing formation, diameter shrinkage part perimeter of section is less than or equal to after shaping the 80% of hollow parts smallest cross-sectional girth；Preform pipe after undergauge being placed in mold cavity, makes full use of mold clamping force when matched moulds and shape flaser texture, then carry out internal high pressure forming, cross sectional shape is flattened in correction simultaneously。Present invention effectively avoids part larger cross-section perimeter portion and cracking phenomena occurs in forming process, and wrinkling when preventing press flat forming；This method achieves a mould two pieces, improves hollow parts forming efficiency。
Description
Technical field
The present invention relates to a kind of hollow parts manufacturing process, the manufacturing process of especially a kind of hollow parts with local flaser texture, belong to forming high pressure in pipe technical field。
Background technology
At present, the part with hollow-core construction is widely used at Aeronautics and Astronautics and Vehicle Engineering, and it has great importance to improving the combination property of parts, minimizing number of parts and manufacturing procedure, reduction manufacturing cost。The part with hollow-core construction generally adopts hydroforming technology manufacture, its main forming process is by pipe internal pressurization and axially afterburning feed supplement, pipe is expressed to the part that mold cavity becomes required, and internal pressure can be transmitted by media such as liquid, elastomer or soft metals。
Having the hollow parts of a kind of special construction in the hollow object of various structures, namely have the internal high pressure forming hollow parts of local flaser texture, its main geometric properties is to differ bigger along the maximum cross-section girth that axis takes with smallest cross-sectional girth。And for the perimeter of section bigger hollow parts of difference, often in Internal High Pressure Forming, part maximum cross-section perimeter portion produces cracking。
Tradition hydroforming technology is appropriate only for hollow parts maximum cross-section girth and the smallest cross-sectional girth less occasion of difference, and its principle choosing pipe is that pipe perimeter of section should be less than or equal to hollow parts smallest cross-sectional girth。And bigger hollow parts is differed with smallest cross-sectional girth for maximum cross-section girth, as having the hollow parts of local flaser texture, if selecting minimal deformation sectional dimension as tube blank size, the deformation extent of sectional dimension major part easily occurs bulging to ftracture due to the limit expansion rate being far longer than material itself, it is impossible to shaping maximum cross-section girth and smallest cross-sectional girth differ bigger hollow parts。
The present invention adopts the size between hollow parts largest cross-sectional sized and smallest cross-sectional size as tube blank size, it is to avoid it produces cracking in forming process。But owing to the perimeter of section of pipe is more than the smallest cross-sectional girth of part, it is made directly shaping according to intermediate sizes pipe, necessarily leads to wrinkling。In order to ensure wrinkle resistant when flattening, first pipe need to be carried out reducing formation, make the perimeter of section at pipe undergauge place less than or equal to the 80% of final formation of parts smallest cross-sectional girth。
On February 13rd, 2013, Chinese invention patent CN102228932 discloses a kind of manufacturing process improving ladder reducer pipe evenness of wall thickness, it adopts electromagnetic method that hollow tube is realized undergauge, utilizes assembling of metal material after undergauge to improve the uniformity of part wall thickness after internal high pressure forming。The method can measure, to a certain degree reducing local deformation in tube-forming processes, the cracking phenomena caused greatly, but it is relatively thin due to pipe self wall thickness, it is impossible to fundamentally stops cracking phenomena；Meanwhile, the method is also not used to the hollow parts shaping with local flaser texture。
Summary of the invention
The technical problem to be solved is in that to overcome drawbacks described above, it is provided that a kind of hollow parts manufacturing process that can effectively prevent hollow parts larger cross-section perimeter portion from ftractureing in forming process and to realize that its local is flattened。
In order to solve above-mentioned technical problem, the invention provides a kind of hollow parts manufacturing process with local flaser texture, comprise the steps:
1), using η as the criterion selecting base principle, after shaping, pipe between hollow parts maximum cross-section girth and smallest cross-sectional girth is as hollow bloom more than or equal to material elongation percentage and perimeter of section to select η, and η is the relative deformation of maximum cross-section and smallest cross-sectional after hollow parts shapes；
2), to hollow bloom carrying out reducing formation, diameter shrinkage part perimeter of section is less than or equal to after shaping the 80% of hollow parts smallest cross-sectional girth；
3), the hollow bloom centering after undergauge is put in shaping dies die cavity, makes diameter shrinkage part between two protruding profiles in mold cavity；
4), matched moulds to after pipe diameter shrinkage part press flat forming to hollow bloom two ends implement seal, gradually topping up pressurization carry out internal high pressure forming and flattening place be corrected, forming pressure 50-120MPa, curring time is 20s-40s；
5), shape after, shed intrinsic pressure, remove left drift and right drift, lift mould, take out the hollow parts with local flaser texture。
In the present invention, described step 1) in,Wherein C1For maximum cross-section girth, C2For smallest cross-sectional girth。
In the present invention, described step 2) in reducing formation process be electromagnetism undergauge, spinning undergauge or extruding undergauge。
In the present invention, described pipe is stainless steel。
The beneficial effects of the present invention is: the intermediate sizes pipe that the present invention adopts effectively avoids part larger cross-section perimeter portion and occurs cracking phenomena in forming process；Meanwhile, pipe being adopted reducing formation, namely pipe diameter shrinkage part perimeter of section is less than the perimeter of section of final press flat forming part, effectively prevent during press flat forming wrinkling；Additionally, this method achieves a mould two pieces, improve hollow parts forming efficiency。
Accompanying drawing explanation
Fig. 1 is the hollow parts manufacturing process flow chart that the present invention has local flaser texture；
Fig. 2 is die assembly schematic diagram in the present invention；
Fig. 3 is electromagnetism reducing device schematic diagram in embodiment 1；
Fig. 4 is the hollow parts that embodiment 1 shapes；
Fig. 5 is spinning reducing device schematic diagram in embodiment 2；
Fig. 6 is the hollow parts that embodiment 2 shapes；
Fig. 7 is extruding reducing device schematic diagram in embodiment 3；
Fig. 8 is the hollow parts that embodiment 3 shapes；
In figure, the left drift of 1-, 2-mould, 3-hollow bloom, the right drift of 4-。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated。
Present invention is mainly used for maximum cross-section girth after shaping and smallest cross-sectional girth difference is relatively big and maximum cross-section deformation extent is more than the shaping of the hollow parts of the elongation percentage of blank tube material own, withAs the criterion selecting base principle, wherein, η is the relative deformation of maximum cross-section and smallest cross-sectional, C after hollow parts shapes1For maximum cross-section girth, C2For smallest cross-sectional girth；η >=material elongation percentage and perimeter of section tubing between hollow parts maximum cross-section girth and smallest cross-sectional girth after shaping chosen by hollow bloom。
Embodiment 1
1), hollow bloom 3 adopt 304 rustless steels, girth is 66mm, and after part forming, bulging place maximum cross-section girth is 110mm, and flattening place smallest cross-sectional girth is 25mm；
2), hollow bloom 3 is carried out electromagnetism reducing formation, after electromagnetism reducing device connects, Guan Bi switch, coil produces magnetic field force, makes hollow bloom 3 reducing formation, and conduction time is 0.02s, hollow bloom 3 minimum place perimeter of section after undergauge is 20mm, as shown in Figure 3；
3), hollow bloom 3 centering after reducing formation is put in mould 2 die cavity, makes undergauge position between two protruding profiles of mould 2 die cavity；
4), be accurately positioned after, control hydraulic press upper and lower mould matched moulds, to hollow bloom 3 diameter shrinkage part press flat forming；Afterwards, adopting left drift 1 and right drift 4 to implement to seal to hollow bloom 3 two ends, topping up pressurization carries out internal high pressure forming and hollow bloom 3 flattening place is corrected simultaneously gradually, ensure that flattening place does not produce to subside, applying internal pressure 50MPa, the time of applying internal pressure is 30s, as shown in Figure 2；
5), shape after, shed intrinsic pressure, remove right-left seal drift, hydraulic press is up, take out shape after hollow parts segmentation after obtain final hollow parts, as shown in Figure 4。
Embodiment 2
1), hollow bloom 3 adopt 321 rustless steels, girth is 100mm, formation of parts shape after bulging place maximum cross-section girth be 141mm, flattening place smallest cross-sectional girth is 63mm；
2), hollow bloom 3 is carried out spinning reducing formation, when undergauge, hollow bloom 3 is placed in clamping device, and rotates along with the rotation of main shaft；Spinning roller does radial feed motion in the outside of hollow bloom 3, and through the deformation gradually of one or many, after making undergauge, perimeter of section is less than original pipe perimeter of section, and the hollow bloom 3 minimum place perimeter of section after undergauge is 50mm, as shown in Figure 5；
3), hollow bloom 3 centering after reducing formation is put in mould 2 die cavity, makes undergauge position between two protruding profiles of mould 2 die cavity；
4) after, being accurately positioned, control hydraulic press upper and lower mould matched moulds, to hollow bloom 3 diameter shrinkage part press flat forming, adopt left drift 1 and right drift 4 to implement to seal to hollow bloom 3 two ends simultaneously, topping up pressurization carries out internal high pressure forming and hollow bloom 3 flattening place is corrected simultaneously gradually, it is ensured that flattening place does not produce to subside, and applies internal pressure as 80MPa, the time of applying internal pressure is 20s, as shown in Figure 2；
5), shape after, shed intrinsic pressure, remove right-left seal drift, hydraulic press is up, take out shape after hollow parts segmentation after obtain final hollow parts, as shown in Figure 6。
Embodiment 3
1), hollow bloom 3 adopt 1Cr18Ni9Ti rustless steel, girth is 79mm, formation of parts shape after bulging place maximum cross-section girth be 126mm, flattening place smallest cross-sectional girth is 38mm；
2), hollow bloom 3 is carried out extruding reducing formation, at room temperature hollow bloom 3 is placed in open type Extruding die, under the promotion of punch, the pipe section of die mouth only does slight reduction, metal is assembled to the die conical surface, making its perimeter of section less than original pipe perimeter of section, the hollow bloom 3 minimum place perimeter of section after undergauge is 30.4mm, as shown in Figure 7；
3), hollow bloom 3 centering after reducing formation is put in mould 2 die cavity, makes undergauge position between two protruding profiles of mould 2 die cavity；
4) after, being accurately positioned, control hydraulic press upper and lower mould matched moulds, to hollow bloom 3 diameter shrinkage part press flat forming, adopt left drift 1 and right drift 4 to implement to seal to hollow bloom 3 two ends simultaneously, topping up pressurization carries out internal high pressure forming and hollow bloom 3 flattening place is corrected simultaneously gradually, it is ensured that flattening place does not produce to subside, and applies internal pressure as 120MPa, the time of applying internal pressure is 40s, as shown in Figure 2；
5), shape after, shed intrinsic pressure, remove right-left seal drift, hydraulic press is up, take out shape after hollow parts segmentation after obtain final hollow parts, as shown in Figure 8。
The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be regarded as protection scope of the present invention。
Claims (4)
1. a hollow parts manufacturing process with local flaser texture, it is characterised in that comprise the steps:
1), using η as the criterion selecting base principle, after shaping, pipe between hollow parts maximum cross-section girth and smallest cross-sectional girth is as hollow bloom more than or equal to material elongation percentage and perimeter of section to select η, and η is the relative deformation of maximum cross-section and smallest cross-sectional after hollow parts shapes；
2), to hollow bloom carrying out reducing formation, diameter shrinkage part perimeter of section is less than or equal to after shaping the 80% of hollow parts smallest cross-sectional girth；
3), the hollow bloom centering after undergauge is put in shaping dies die cavity, makes diameter shrinkage part between two protruding profiles in mold cavity；
4), matched moulds to after pipe diameter shrinkage part press flat forming to hollow bloom two ends implement seal, gradually topping up pressurization carry out internal high pressure forming and flattening place be corrected, forming pressure 50-120MPa, curring time is 20s-40s；
5), shape after, shed intrinsic pressure, remove left drift and right drift, lift mould, take out the hollow parts with local flaser texture。
2. a kind of hollow parts manufacturing process with local flaser texture according to claim 1, it is characterised in that described step 1) in,Wherein C1For maximum cross-section girth, C2For smallest cross-sectional girth。
3. according to claim 1 and 2 have local flaser texture hollow parts manufacturing process, it is characterised in that: described step 2) in reducing formation process be electromagnetism undergauge, spinning undergauge or extruding undergauge。
4. the hollow parts manufacturing process with local flaser texture according to claim 3, it is characterised in that: described pipe is stainless steel。
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105666062B (en) * | 2016-03-25 | 2018-06-08 | 南通昌荣机电有限公司 | A kind of production method of cover of wedge |
| CN105689487A (en) * | 2016-03-30 | 2016-06-22 | 江苏界达特异新材料股份有限公司 | Diameter-changing performing technology and diameter-reducing device of internal high-pressure forming tube |
| CN107052126A (en) * | 2017-04-17 | 2017-08-18 | 无锡朗贤汽车组件研发中心有限公司 | Fittings hydraulic formation equipment |
| CN110153660A (en) * | 2019-07-03 | 2019-08-23 | 沈建青 | A kind of manufacture craft of eccentric joint |
| CN111098098B (en) * | 2020-01-03 | 2021-07-20 | 田开宜 | High-pressure internal core-pulling forming method for bent pin joint |
| CN113878016B (en) * | 2021-09-28 | 2024-03-08 | 上海孚庭科技有限公司 | Forming method of pipe fitting with complex section |
| CN114029390A (en) * | 2021-11-10 | 2022-02-11 | 南京航威智造科技有限公司 | Inner high-pressure bent pipe shaping method |
| CN114789217A (en) * | 2022-04-27 | 2022-07-26 | 广东轻量科技发展有限责任公司 | Automobile axle housing, automobile axle housing mold and forming method |
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|---|---|---|---|---|
| DE19711103B4 (en) * | 1997-03-06 | 2005-03-10 | Udo Hellwig | Method for deforming components by the action of magnetic forces |
| CN1824405A (en) * | 2005-08-08 | 2006-08-30 | 孙旭光 | Extrnal heating metal pipe high temperature ultra high water pressure once shaping technology method and equipment |
| CN102228932A (en) * | 2011-04-22 | 2011-11-02 | 哈尔滨工业大学 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10220429B4 (en) * | 2002-05-08 | 2006-03-02 | Amborn, Peter, Dr.-Ing. | Method for producing a hollow metal body |
| JP5437730B2 (en) * | 2009-07-31 | 2014-03-12 | 本田技研工業株式会社 | Hot bulge forming apparatus, hot bulge forming method, and hot bulge formed product |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19711103B4 (en) * | 1997-03-06 | 2005-03-10 | Udo Hellwig | Method for deforming components by the action of magnetic forces |
| CN1824405A (en) * | 2005-08-08 | 2006-08-30 | 孙旭光 | Extrnal heating metal pipe high temperature ultra high water pressure once shaping technology method and equipment |
| CN102228932A (en) * | 2011-04-22 | 2011-11-02 | 哈尔滨工业大学 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
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